Merge pull request #646 from mtsr/disable-button

Disabled button docs and consistent behavior

native/src/widget/button.rs

@@ -29,6 +29,29 @@ use std::hash::Hash;
 /// let button = Button::new(&mut state, Text::new("Press me!"))
 ///     .on_press(Message::ButtonPressed);
 /// ```
+///
+/// If a [`Button::on_press`] handler is not set, the resulting [`Button`] will
+/// be disabled:
+///
+/// ```
+/// # use iced_native::{button, Text};
+/// #
+/// # type Button<'a, Message> =
+/// #     iced_native::Button<'a, Message, iced_native::renderer::Null>;
+/// #
+/// #[derive(Clone)]
+/// enum Message {
+///     ButtonPressed,
+/// }
+///
+/// fn disabled_button(state: &mut button::State) -> Button<'_, Message> {
+///     Button::new(state, Text::new("I'm disabled!"))
+/// }
+///
+/// fn enabled_button(state: &mut button::State) -> Button<'_, Message> {
+///     disabled_button(state).on_press(Message::ButtonPressed)
+/// }
+/// ```
 #[allow(missing_debug_implementations)]
 pub struct Button<'a, Message, Renderer: self::Renderer> {
     state: &'a mut State,
@@ -97,6 +120,7 @@ where
     }
 
     /// Sets the message that will be produced when the [`Button`] is pressed.
+    /// If on_press isn't set, button will be disabled.
     pub fn on_press(mut self, msg: Message) -> Self {
         self.on_press = Some(msg);
         self

web/src/widget/button.rs

@@ -20,6 +20,26 @@ use dodrio::bumpalo;
 /// let button = Button::new(&mut state, Text::new("Press me!"))
 ///     .on_press(Message::ButtonPressed);
 /// ```
+///
+/// If a [`Button::on_press`] handler is not set, the resulting [`Button`] will
+/// be disabled:
+///
+/// ```
+/// # use iced_web::{button, Button, Text};
+/// #
+/// #[derive(Clone)]
+/// enum Message {
+///     ButtonPressed,
+/// }
+///
+/// fn disabled_button(state: &mut button::State) -> Button<'_, Message> {
+///     Button::new(state, Text::new("I'm disabled!"))
+/// }
+///
+/// fn enabled_button(state: &mut button::State) -> Button<'_, Message> {
+///     disabled_button(state).on_press(Message::ButtonPressed)
+/// }
+/// ```
 #[allow(missing_debug_implementations)]
 pub struct Button<'a, Message> {
     content: Element<'a, Message>,
@@ -90,6 +110,7 @@ impl<'a, Message> Button<'a, Message> {
     }
 
     /// Sets the message that will be produced when the [`Button`] is pressed.
+    /// If on_press isn't set, button will be disabled.
     pub fn on_press(mut self, msg: Message) -> Self {
         self.on_press = Some(msg);
         self
@@ -153,6 +174,8 @@ where
             node = node.on("click", move |_root, _vdom, _event| {
                 event_bus.publish(on_press.clone());
             });
+        } else {
+            node = node.attr("disabled", "");
         }
 
         node.finish()